<template>
    <div class="list" ref="wrapper">
        <div>
            <div class="area">
                <div class="title border-topbottom">当前城市</div>
                <div class="buttonList">
                    <div class="btnWrapper"> 
                        <div class="buttonItem">{{this.currentCity}}</div>
                    </div>
                </div>
            </div>
            <div class="area">
                <div class="title border-topbottom">热门城市</div>
                <div class="buttonList">
                    <div 
                        class="btnWrapper" 
                        v-for="item of hot" 
                        :key="item.id"
                        @click="handleCityClick(item.name)"
                    > 
                        <div class="buttonItem">{{item.name}}</div>
                    </div>
                </div>                     
            </div>
            <div 
                class="area" 
                v-for="(item, key) of cities" 
                :key="key"
                :ref="key"
            >
                <div class="title border-topbottom">{{key}}</div>
                <div class="list-item">
                    <div 
                        class="item border-bottom" 
                        v-for="innerItem of item" 
                        :key="innerItem.id"
                        @click="handleCityClick(innerItem.name)"
                    >
                        {{innerItem.name}}
                    </div>  
                </div>
            </div>
        </div>
    </div>
</template>

<script>
import { mapState } from 'vuex'
import BScroll from 'better-scroll'
export default {
    name: "CityList",
    props: {
        cities: Object,
        hot: Array,
        letter: String
    },
     computed: {
      ...mapState ({
          currentCity: 'city'
      })
    },
    methods: {
       handleCityClick (city) {
           this.$store.commit('changeCity', city)
           this.$router.push('/')
       } 
    },
    mounted () {
        this.scroll = new BScroll(this.$refs.wrapper)
    },
    watch: {
        letter () {
           if (this.letter) {
               const element = this.$refs[this.letter][0]
               this.scroll.scrollToElement(element)
           }
        }
    }
}
</script>

<style lang="stylus" scoped>
    .border-topbottom
        &:before
            border-color: #ccc
        &:after
            border-color: #ccc
    .border-bottom
        &:before
            border-color: #ccc
    .list
        overflow: hidden
        position: absolute
        top: 1.38rem
        left: 0
        bottom: 0
        right: 0
    .title
        line-height: .45rem
        background: #eee
        padding-left: .2rem
        color: #666
        font-size: .26rem
    .buttonList
        overflow: hidden
        padding: .1rem .6rem .1rem .1rem
        .btnWrapper
            width: 33.33%
            float: left
            .buttonItem
               padding: .1rem 0
               text-align: center
               margin: .1rem
               border: .02rem solid #ccc
               border-radius: .06rem
    .list-item
        .item
            line-height: .54rem
            color: #666
            padding-left: .2rem
</style>
